6398837855 has 4 divisors (see below), whose sum is σ = 7678605432. Its totient is φ = 5119070280.

The previous prime is 6398837839. The next prime is 6398837873. The reversal of 6398837855 is 5587388936.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6398837855 - 2⁴ = 6398837839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639883781 + ... + 639883790.

It is an arithmetic number, because the mean of its divisors is an integer number (1919651358).

Almost surely, 2^6398837855 is an apocalyptic number.

6398837855 is a deficient number, since it is larger than the sum of its proper divisors (1279767577).

6398837855 is a wasteful number, since it uses less digits than its factorization.

6398837855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279767576.

The product of its digits is 43545600, while the sum is 62.

The square root of 6398837855 is about 79992.7362639884. The cubic root of 6398837855 is about 1856.5231474912.

The spelling of 6398837855 in words is "six billion, three hundred ninety-eight million, eight hundred thirty-seven thousand, eight hundred fifty-five".